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What does $# mean in shell How do i do that in bash? There are many shell implementations available, like sh, bash, c shell, z shell, etc.

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Is the pid of the most recent background command I want to redirect both standard output and standard error of a process to a single file $0 is the name of the shell or shell script

Most of the above can be found under special parameters in the bash reference manual

Here are all the environment variables set by the shell For a comprehensive index, please see the reference manual variable index. In shell, when you see $ command one && command two the intent is to execute the command that follows the && only if the first command is successful This is idiomatic of posix shells, and not only found in bash

It intends to prevent the running of the second process if the first fails. You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do i get it

Instead, you can save this post to reference later.

A bashism is a shell feature which is only supported in bash and certain other more advanced shells It will not work under busybox sh or dash (which is /bin/sh on a lot of distros), or certain other shells like the /bin/sh provided on freebsd. In man bash we can read in shell builtin commands section (online doc) The exit, logout, break, continue, let, and shift builtins accept and process.

What can you do with the eval command There is no man page for it.